Document.title

Syntax

title is a string containing the document's title. If the title was overridden by setting document.title, returns that value. Otherwise returns the title specified in the markup (see the Notes below).

document.title = newTitle;

newTitle is the new title of the document. The assignment affects the return value of document.title, the title displayed for the document (e.g. in the titlebar of the window), and it also affects the DOM of the document (e.g. the content of the <title> element in an HTML document).